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49ers QB Nick Mullens better than expected but not yet a proven commodity

San Francisco 49ers quarterback Nick Mullens warms up before an NFL football game against the Seattle Seahawks, Sunday, Dec. 2, 2018, in Seattle. (AP Photo/Elaine Thompson)

San Francisco 49ers quarterback Nick Mullens warms up before an NFL football game against the Seattle Seahawks, Sunday, Dec. 2, 2018, in Seattle. (AP Photo/Elaine Thompson)

Photo: Elaine Thompson / Associated Press

Nick Mullens is the 49ers’ starter, but he has yet to prove he’s a starting-caliber NFL quarterback.

At least that was head coach Kyle Shanahan’s assessment when asked if Mullens has shown No.